Internet of things device hierarchies

ABSTRACT

In embodiments, Internet of Things (IoT) devices may be organized according to an IoT device hierarchy, which may include parent and/or child associations between resources associated with IoT devices and/or with groupings of IoT devices. IoT devices wishing to support an IoT device hierarchy may utilize an extended IoT device resource model which provides for IoT device hierarchy information and interfaces to be provided by supporting IoT devices. A supporting resource may have one or more parent properties and/or child properties which may identify, respectively, parent or child resources which are associated with the resource. In various embodiments, these parent properties and/or child properties may include uniform resource identifiers (URI). A supporting resource may also identify an interface type for a hierarchical access interface, through which one or more descendant resources may be accessed through a single command. Other embodiments may be descried and/or claimed.

TECHNICAL FIELD

The present disclosure relates to the field of data processing, inparticular, to apparatuses, methods and storage media associated withaccessing Internet of Things (IoT) devices.

BACKGROUND

The background description provided herein is for the purpose ofgenerally presenting the context of the disclosure. Unless otherwiseindicated herein, the materials described in this section are not priorart to the claims in this application and are not admitted to be priorart by inclusion in this section.

Computing devices continue to proliferate as there are greater andgreater calls for computing power to be introduced into everyday devicesand situations. Society continues to increase progress toward the“Internet of Things” (IoT), with its promise of ubiquitous computingavailability in buildings, objects, spaces, etc. However, with theproliferation of IoT devices for home and business environments,managing and maintaining such devices threatens to become a dauntingtask. For example, oftentimes devices may be located in many differentlocations throughout a building or space; it may be difficult toidentify these scattered devices. Further, users or systems mayoftentimes need to access multiple devices of a particular type at once.For example, a user may desire to turn on all IoT-enabled lights in aparticular section of a building. It can be daunting to identify,locate, and then access IoT devices when these devices are notwell-organized.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments will be readily understood by the following detaileddescription in conjunction with the accompanying drawings. To facilitatethis description, like reference numerals designate like structuralelements. Embodiments are illustrated by way of example, and not by wayof limitation, in the Figures of the accompanying drawings.

FIG. 1 illustrates an example IoT device hierarchy, in accordance withvarious embodiments.

FIG. 2 illustrates an example extension of a resource model for an IoTdevice to support an IoT device hierarchy, in accordance with variousembodiments.

FIG. 3 illustrates example information flows between an IoT clientapplication and IoT devices in an IoT device hierarchy, in accordancewith various embodiments.

FIG. 4 illustrates an example process for accessing IoT devices in anIoT hierarchy, in accordance with various embodiments.

FIG. 5 illustrates an example process for setting up IoT devices in anIoT hierarchy, in accordance with various embodiments.

FIG. 6 illustrates an example process for accessing a resource of an IoTdevice in an IoT hierarchy, in accordance with various embodiments.

FIG. 7 illustrates another example process for accessing a resource ofan IoT device in an IoT hierarchy, in accordance with variousembodiments.

FIG. 8 illustrates an example computing environment suitable forpracticing various aspects of the present disclosure, in accordance withvarious embodiments.

FIG. 9 illustrates an example storage medium with instructionsconfigured to enable an apparatus to practice various aspects of thepresent disclosure, in accordance with various embodiments.

DETAILED DESCRIPTION

In the following detailed description, reference is made to theaccompanying drawings which form a part hereof wherein like numeralsdesignate like parts throughout, and in which is shown by way ofillustration embodiments that may be practiced. It is to be understoodthat other embodiments may be utilized and structural or logical changesmay be made without departing from the scope of the present disclosure.Therefore, the following detailed description is not to be taken in alimiting sense, and the scope of embodiments is defined by the appendedclaims and their equivalents.

Various operations may be described as multiple discrete actions oroperations in turn, in a manner that is most helpful in understandingthe claimed subject matter. However, the order of description should notbe construed as to imply that these operations are necessarily orderdependent. In particular, these operations may not be performed in theorder of presentation. Operations described may be performed in adifferent order than the described embodiment. Various additionaloperations may be performed and/or described operations may be omittedin additional embodiments.

For the purposes of the present disclosure, the phrase “A and/or B”means (A), (B), or (A and B). For the purposes of the presentdisclosure, the phrase “A, B, and/or C” means (A), (B), (C), (A and B),(A and C), (B and C), or (A, B and C).

The description may use the phrases “in an embodiment,” or “inembodiments,” which may each refer to one or more of the same ordifferent embodiments. Furthermore, the terms “comprising,” “including,”“having,” and the like, as used with respect to embodiments of thepresent disclosure, are synonymous.

As used herein, the term “logic” and “module” may refer to, be part of,or include an Application Specific Integrated Circuit (ASIC), anelectronic circuit, a processor (shared, dedicated, or group) and/ormemory (shared, dedicated, or group) that execute one or more softwareor firmware programs, a combinational logic circuit, and/or othersuitable components that provide the described functionality. Asdescribed herein, the term “logic” and “module” may refer to, be partof, or include a System on a Chip, as described below.

In various embodiments, IoT devices may be organized according to an IoTdevice hierarchy. In various embodiments, the IoT device hierarchy mayinclude parent and/or child associations between resources associatedwith IoT devices and/or with groupings of IoT devices. In variousembodiments, the hierarchy may take the form of a tree, where resourcesof an IoT device may have one or more children associated with it, whilesome resources (such as leaves in the tree hierarchy) may have noassociated children. In such tree embodiments, each resource may have upto one associated parent resource (or no parent, in the case of atop-level resource), thus forming branching tree structures. However, inother embodiment, resources of IoT devices may be organized to beassociated with multiple parent resources.

In various embodiments, resources in IoT device hierarchies may beorganized using extensions to a resource model for a resource of an IoTdevice. In such embodiments, IoT devices wishing to support an IoTdevice hierarchy may utilize an extended IoT device resource model whichprovides for IoT device hierarchy information and interfaces to beprovided by supporting IoT devices. Examples of this information areprovided below. In various embodiments, by extending a resource modelfor a resource to include IoT device hierarchy information, an IoTdevice which is to be utilized in an IoT device hierarchy may thus beutilized alongside other IoT devices or by IoT applications which do notsupport IoT device hierarchies without requiring the non-supportingdevices or applications to be modified.

Thus, in various embodiments, a supporting resource may have one or moreparent properties and/or child properties which may identify,respectively, parent or child resources which are associated with theresource. In various embodiments, these parent properties and/or childproperties may include uniform resource identifiers (URI) for therelevant parent or child resources. In such embodiments, the propertiesmay be referred to as parent URI properties or child URI properties. Invarious embodiments a supporting resource may also identify an interfacetype for a hierarchical access interface. In various embodiments,through use of the hierarchical access interface implemented by adevice, one or more descendant resources may be accessed through asingle command, thus providing for wider-scale access than through othertechniques.

In various embodiments, IoT devices described herein may include variousforms and types of devices, including, but not limited to, laptopcomputers, mobile devices such as mobile phones, tablets, etc. wearabledevices such as computing-enabled glasses or watches as well as otherdevices, such as computing-enabled light bulbs, thermostats,televisions, refrigerators, microwave ovens, convectional ovens, winerefrigerators, etc. Additionally, while the term “computing devices” isused throughout to refer to devices and/or objects that have computingcapabilities, no particular limitation should be inferred by this usage.Thus, in various embodiments, the “computing devices” referred to hereinmay include desktop or laptop computers, mobile devices,computing-capable sensors (e.g. thermometers, light sensors, etc.),computing-capable appliances (e.g., refrigerators), home automationequipment, vehicles, audio/visual equipment, etc. Additionally, the term“resource” as used herein may include logical representations ofphysical items, including computing devices and various non-computingdevices, such as, but not limited to, lighting elements, bulbs, fans,appliances, etc. The term “resource” may also include logicalrepresentations of non-physical items, such as spaces or locations. Theterm “resource” may also include groupings of physical and/ornon-physical items such as, but not limited to, groupings of devices,spaces, or locations. For example, a resource may be associated with abuilding or floor of a building, and may have associated resourcechildren which are located in that building or on that floor. Thus,using IoT device hierarchy techniques described herein, multipleresources associated with a particular location or area may beidentified or accessed through a parent resource that models thatlocation or area. Examples of such access are described below.

It may be noted, that, through the use of resources to represent devicesand/or groupings of devices, the IoT device hierarchy techniquesdescribed herein may provide for hierarchies that are orthogonal to anyparticular groupings of resources. Thus, an IoT hierarchy may includeparent/child relationships between devices, between groupings or otherlogical representations of devices, or between groupings themselves.

Referring now to FIG. 1, an example IoT device hierarchy 100 isillustrated in accordance with various embodiments. In the particularexample of FIG. 1, the IoT device hierarchy 100 includes a hierarchicalstructure of resources of a set of buildings, referred to as “JonesFarm”. In particular, it may be noted that the IoT device hierarchy 100includes a root level 110 with a resource 115 representing the entireJones Farm. The IoT device hierarchy 100 also includes a second level120 which includes multiple building resources. In the example of FIG.1, each of the building resources in level 120 is associated with theJones Farm resource 125 as a parent resource. Conversely resource 125,which is for Building 2 of Jones Farm, is associated with multiplechildren resources at level 130, each of which (in the example)represents a floor of Building 2. Resource 135, which represents Floor 2of Building 2, in turn is associated with multiple resourcesrepresenting rooms, such as resource 145, which represents Conferenceroom n. Resource 145 is associated with multiple IoT devices that arephysically present in Conference Room n, including Lights 1 through n,which are resources 153 and 154 in the IoT device hierarchy 100, Tube 1,which is resource 155, and light array 1, which is resource 158.

Referring now to FIG. 2, an example extension of a resource model 200for an IoT device to support an IoT device hierarchy is illustrated inaccordance with various embodiments. In various embodiments, theresource model may contain one or more elements that may be utilized byknown resource models for representation of IoT devices, either with orwithout IoT device hierarchy support. Thus, in the example of FIG. 2, anOpen Interconnect Consortium (“OIC”) resource model is illustrated,along with extensions to the model implementing the techniques describedherein. However, in various embodiments, techniques described herein maybe utilized with other IoT models, such as, for example a ConstrainedApplication Protocol (“CoAP”) or an HTTP resource model, as may beunderstood.

Thus, for example, the resource model 200 may include a URI 201, whichmay provide a unique identifier for a resource on a server. In theexample of FIG. 2, a light-emitting diode (LED) light bulb may have aURI 201 of “/confRoom1//led”. The resource model may also include one ormore properties 202 describing the resource. For example, a resource mayinclude one or more Resource Type properties that may describe types forthe resource (for example, “ledbulb”). The resource may also include oneor more Interface Types that may describe interfaces that are supportedby the resource. For example, an LED bulb device may implement a“default” interface, which may be understood to provide basic access tostate information and/or the ability to change a state of the LED bulb.In another example, the resource model 200 may include one or moreattributes 203 that record a functional state of the resource. Forexample, the LED bulb may have a State attribute which has a BooleanON/OFF value, a Brightness value of 1-10, and/or a color valuerepresented by a string of red, green, and blue values. In variousembodiments, other aspects of these elements resource model 200 may beknown, and thus will not be belabored herein.

In various embodiments, in order to support IoT device hierarchies, theresource model 200 may include one or more extensions which may providefacility for IoT device hierarchy support. In the example of FIG. 2,these extensions are provided as new properties 210, 220, and 250, andare marked out using dashed rounded boxes. In various embodiments, theresource model 200 may include parent and child properties which refer,respectively to other resources that are associated in the IoT devicehierarchy as parents or children of the resource using the resourcemodel 200. In particular, the resource model 200 may include a ParentURI property (PU) 210, which may include URI references to a parentresource. For example, in FIG. 1, the Tube 1 resource 155 may have a PU210 which provides a URI to the Conference room n resource 145. Theresource model 200 may also include one or more Child URI properties(CU) 220, which may include URI references to one or more childresources. For example, in FIG. 1, the Floor 2 resource 135 may have aCU 220 which provides a URI to the Conference room n resource 145. Whileit may be noted that, in the example of FIG. 2, a PU 210 is providedwhile multiple CU 220 s may be provided, in various embodiments, theresource model 200 may be extended to utilize multiple PU 210 s.

In various embodiments, the resource model may also include ahierarchical access interface (HAI) 250. In various embodiments,implementation of the HAI 250 by an IoT device may be indicated in theresource model by an Interface Type, such as the “tree” Interface Typeillustrated. In various embodiments, the HAI 250 may provide for accessto multiple resources which are descendants of a resource in an IoTdevice hierarchy. In various embodiments, the term “descendant” may beused to refer to one or more resources which are at a lower level in anIoT device hierarchy than a given resource. For example, descendants ofa resource may include its children, children of its children, etc. Invarious embodiments, the HAI 250 may provide for access to all resourcesthat are descendants of a resource, or a sub-set thereof. In variousembodiments, the HAI 250 may provide for access to a sub-set ofresources by providing access to those resources that match a particularproperty or set of properties. For example, if a client applicationintends to turn a set of LED lights on a Floor 1 (using a resource withURI “/floor/1”) to color “R” with brightness 2, this may be performedusing a known “PUT” command to set a state of all LED resources whichare descendants of the Floor 2:

-   -   PUT coap://1.1.1.1/floor/1?IF=tree&RT=ledbulb        {Payload:state=ON,brightness=2,color=R}        Using this command, in various embodiments, every descendant        resource that matches the Resource Type “ledbulb” may be set to        ON with power 2 and color “R”. This may be true even if some        intervening descendants in the IoT device hierarchy do not match        Resource Type “ledbulb”. For example, while resource 145 for        Conference room n may not match the Resource Type “LED”, the        above-command may still provide that LED resources that are        descendants of resource 145 may still be turned on. In various        embodiments, resource types may be added to resources in order        to associate those resources together in a group. For example,        all external lights may be associated with an “external”        Resource Type and the HAI 250 may be utilized to turn on all        lights that match this Resource Type.

Referring now to FIG. 3, example information flows between an IoT clientapplication 350 and IoT devices in an IoT device hierarchy 300 are shownin accordance with various embodiments. FIG. 3 illustrates variousexamples of the IoT client application 350 accessing one or moreresources in the IoT device hierarchy 300 according to variousembodiments. In various embodiments, the IoT client application may beimplemented in various form factors and on types of equipment,including, but not limited to, laptops or desktop computers, mobiledevices, smartphones, tablet computers, etc. Additionally, in variousembodiments, the IoT client application 350 may be configured to accessIoT device resources in the IoT device hierarchy 300 using various knownmethods, which may be extended according to IoT device hierarchytechniques described herein. For example, in various embodiments, theIoT client application 350 may be configured to perform GET or PUTcommands, which may, respectively, retrieve or set attributes of IoTresources, as may be understood. It may be understood that, while onlyparticular resources are illustrated in FIG. 3 for the purposes ofsimplified illustration, in various embodiments the illustratedresources may only represent a sub-set of possible resources for an IoTinfrastructure.

In the example of FIG. 3, an example resource 310 for Floor 1 is shown.The resource 310 is associated with two child resources 320 and 325,which are associated with Room 101 and Room 102 on Floor 1,respectively. Room 102 is associated with two child resources, resource330, which is associated with a Fixture in Room 102, and resource 335,which is associated with a Light Array in Room 102. The resource 335 isitself associated with two ledbulb resources, resources 340 and 345. Asillustrated in FIG. 3, one or more of the IoT resources may have anactuator, such as actuator 348 of resource 345, which may be configuredto set attributes of the resource, as may be understood. It may beunderstood that, for the purposes of simplified illustration, that onlyparticular properties are illustrated relative to each illustratedresource. Additionally, it may be noted that the particular exampleillustrates hierarchical relationships between resources representinggroupings of other resources (e.g., the relationship between resources310 and 325) and between a grouping and a device (e.g., the relationshipbetween resources 335 and 348). However, in other scenarios,hierarchical relationships may also exist between devices, and groupingsmay exist outside of hierarchical relationships (such as if resourcesare grouped by having a resource type in common).

FIG. 3 illustrates three examples of how the IoT client application mayaccess IoT device resources in accordance with various embodiments. Inthe first, the IoT client application 350 may obtain properties for aresource, and receive one or more properties of the resource. In variousembodiments, properties may be obtained using various techniques, suchas by performing resource discovery, as may be understood. An example ofsuch interaction may be found at interactions 1 a and 1 b in FIG. 3. Atinteraction 1 a, the IoT client application 350 has made a propertyrequest (e.g. a GET command) to the resource 310, which represents theFloor 1 in the IoT device hierarchy 300. In response to this propertyrequest, at interaction 1 b, the resource 310 has replied with a set ofproperties exhibited by the resource. In this example, the resource hasCU 220 properties and HAI 250 Interface Type properties, thus indicatingto the client application 350 that it supports the IoT device hierarchytechniques described herein. Further, the resource 310 provides thevalues of its CU 220 properties, which include references (e.g. URIs) toits child resources, resource 320 and resource 325 (for Room 101 andRoom 102, respectively). Through this interaction, the IoT clientapplication 300 may determine that the resource 310 supports IoT devicehierarchy techniques, as well as a portion of the structure of the IoTdevice hierarchy 300 to which the resource 310 belongs.

In another example interaction, a device may provide IoT devicehierarchy information on its own, such as when entering or leaving anetwork or IoT device hierarchy. For example, when an IoT device isintroduced to an IoT device network a resource of the device may, invarious scenarios, make it presence known by broadcasting deviceinformation to other IoT devices and/or IoT client applications, asmaybe understood. In other scenarios, when an IoT device goes offline,such as when it is turned off or has an error, a resource may announceits imminent removal from the network. In various embodiments, however,the resource may provide IoT device hierarchy information whenbroadcasting presence or removal. For example, in interaction 2 of FIG.3, resource 335 may have been recently brought into the IoT devicehierarchy 300. In response to joining the IoT device hierarchy, theresource 335 announces its presence and includes in that announcementits resource type, PU 210, and CU 220 s. In this case, the resource 335announces that it is associated with resource 325 (Room 102) as a parentand resources 340 and 345 (Light 1 and Light 2, respectively) as childresources. In each case, in various embodiments, the resource mayprovide URIs to the parent and/or child resources.

In yet another interaction, the IoT client application may utilize theHAI 250 to set one or more properties of the IoT device hierarchy 300.In particular, as discussed above, the HAI 250 may be utilized to set anattribute of descendants (e.g. all descendants or a sub-set thereof) ofa particular resource. In the example of interaction 3 of FIG. 3, theIoT client application 300 uses the HAI 250 of the resource 325 to setall “light” resources to “ON”. In this example, all descendants ofresource 325 which have the “light” property are then turned on, e.g.,resources 330, 340, and 345 are turned on (as illustrated in FIG. 3 bythe diagonal pattern). However, no action is taken on resource 335,which does not exhibit the “light” property.

Referring now to FIG. 4, an example process 400 for accessing IoTdevices in an IoT hierarchy is illustrated in accordance with variousembodiments. While FIG. 4 illustrates particular operations in aparticular order, in various embodiments the operations may be combined,split into parts, and/or omitted. The process may begin at operation410, where one or more IoT devices may be set up. For example, atoperation 410, IoT devices may be brought online determined within theIoT device hierarchy, and/or have their presence (and IoT devicehierarchy information) made available to other IoT devices and/or clientapplications. Particular embodiments of the process of operation 410 maybe described below with reference to process 500 of FIG. 5. Next, atoperation 420, one or more resources of an IoT device may be identifiedfor access. For example, an IoT client application or a user of one, mayidentify that a particular light resource should be turned on. Inanother example, at operation 420 it may be determined that a set ofdevices in a particular area represented by a particular resource shouldbe accessed. Next, at operation 430, the IoT client application (orother application or user) may access the resource or resources usingthe IoT hierarchy. Particular embodiments of the process of operation430 may be described below with reference to processes 600 of FIG. 6 and700 of FIG. 7. The process may then end.

Referring now to FIG. 5, an example process 500 for setting up IoTdevices in an IoT hierarchy is illustrated in accordance with variousembodiments. In various embodiments, process 500 may be performed toimplement, in whole or in part, operation 410 of process 400 of FIG. 4.While FIG. 5 illustrates particular operations in a particular order, invarious embodiments the operations may be combined, split into parts,and/or omitted. The process may begin at operation 510, where the IoTdevice may be brought into the network. In various embodiments, this mayinclude various known techniques, including, but not limited to,physical movement of an IoT device, imitation or powering-on of an IoTdevice, connection to a wired or wireless network, direction to an IoTdevice to join a particular IoT device network, etc. Next, at operation520, a place may be determined for one or more resources of the IoTdevice in the IoT device hierarchy. For example, if the device is alight that is in a particular room, it may be determined that a lightresource for the IoT device should be a child of a resource representingthat room. Next, at operation 530, parent and/or child resources for thenew resources may be determined. Thus, in the previous example, aresource representing the room where the light has been added may beidentified to be added as a parent resource of the newly-added lightresource. In various embodiments, these determinations may be performedby an IoT client application and/or by a user. Next, at operation 540,parent and child resources for the newly-added resource may be set. Invarious embodiments, at operation 540, a PU 210 and/or CU 220 s of theresource may be set with URIs of a parent resource or of childresources, respectively.

Next, at optional operation 550, one or more resource type propertiesmay be added to the resource, such as to place the resource into one ormore groups. For example, if a subset of lights are emergency lights,then an “emergency” resource type property could be added to theresources for each of these lights. In such scenarios, the HAI 250 maylater be utilized to turn on only those lights that match the particular“emergency” resource type. This would allow for sub-sets of descendantresources, such as all emergency lights in a particular building, or ina particular room, to be turned on or off. After operation 550, atoperation 560, the IoT device may advertise the presence of one or moreresources provided by the IoT device to other IoT devices or to the IoTclient application. As discussed above, this advertisement of presencemay include resource type and IoT device hierarchy information, such asthe PU 210 and/or CU 220 s of each resource, as applicable. The processmay then end.

Referring now to FIG. 6, an example process 600 for accessing a resourceof an IoT device in an IoT hierarchy is illustrated in accordance withvarious embodiments. In various embodiments, process 600 may beperformed to implement, in whole or in part, operation 430 of process400 of FIG. 4. While FIG. 6 illustrates particular operations in aparticular order, in various embodiments the operations may be combined,split into parts, and/or omitted.

In the particular example of FIG. 6, an IoT client application 350 mayaccess multiple resources of an IoT device hierarchy utilizing the HAI250. The process may begin at operation 610, where an initial resourcemay receive an access request through its HAI. In various embodiments,this access request through the HAI 250 may include one or moreproperties which may be matched by the HAI as access proceeds. Theexample provided above may be recalled:

-   -   PUT coap://1.1.1.1/floor/2?IF=tree&RT=LED        {Payload:state=ON,power=2,color=R}        As discussed above, using this command an IoT client application        may request that every descendant resource that matches the        Resource Type “LED” may be set to ON with power 2 and color “R”.

Next, at decision operation 615, handler logic associated with theresource may determine whether the resource matches the propertiesreceived in the request made through the HAI 250. In the example above,the resource may determine whether it matches the Resource Type LED. Invarious embodiments, this handler logic may include software and/orhardware components that are part of a device hosting the resource. Inother embodiments, multiple properties may be matched, such as if theresource has Resource Types that indicate its being associated with aparticular group of resources. If, at decision operation 615, theresource determines that it matches the received properties, then atoperation 620, the particular requested access may be performed on theresource itself. For example, a requested attribute, such as the lightstate may bet set. If at decision operation 615 the properties do notmatch then no access may be performed.

In either event, the process may then proceed to operation 630, wherethe resource may determine its children, such as through one or more CU220 s of the resource. After determination of the children of theresource, at loop operation 640, a loop may begin for every child of theresource. In the loop, at operation 650, the process of FIG. 6 may berepeated for the current child. In some embodiments, the repeatedprocess may begin at decision operation 615, as the access request mayhave already been received. After performance of the process for thecurrent child, the loop may continue for the next child. Aftercompletion of the loop for each child resource, the process may thenend. In various embodiments, if the process is currently being performedfor a child of another resource, a higher-level instance of process 600may then continue for a sibling resource of the current resource.

Referring now to FIG. 7, another example process 700 for accessing aresource of an IoT device in an IoT hierarchy is illustrated inaccordance with various embodiments. In various embodiments, process 700may be performed to implement, in whole or in part, operation 430 ofprocess 400 of FIG. 4. While FIG. 7 illustrates particular operations ina particular order, in various embodiments the operations may becombined, split into parts, and/or omitted.

In the particular example of FIG. 7, an IoT client application 350 maybe receiving information about an IoT device hierarchy when an IoTdevice leaves (or otherwise becomes unavailable in) an IoT devicenetwork. The process may begin at operation 710, where the IoT clientapplication 350 may receive a notification that the IoT device willbecome unavailable. In response, at operation 720, the IoT clientapplication 350 may request, from a resource of the IoT device, childand parent resource information from the resource, such as by requestingthe PU 210 and/or CU 220 s of the resource. In alternative embodiments,the resource may provide parent and/or child resource information aspart of operation 710. Next, at operation 730, the IoT clientapplication 350 may modify child information for the parent of theaffected resource, such as by updating one or more CU 220 s to removethe URI of the affected resource. In another example, the IoT clientapplication 350 may set one or more CU 220 s of the parent resource toURIs for one or more children resources of the affected resource, thuscollapsing/connecting an affected portion of the IoT device hierarchy.Next, the IoT client application 350 may access children of the affectedresource as needed. For example, the IoT client application 350 mayupdate PU 210 s of the child resources, or may change settings of thechild resources as appropriate. The process may then end.

Referring now to FIG. 8, an example computer suitable for practicingvarious aspects of the present disclosure, including processes of FIGS.4-7, is illustrated in accordance with various embodiments. As shown,computer 800 may include one or more processors or processor cores 802,and system memory 804. For the purpose of this application, includingthe claims, the terms “processor” and “processor cores” may beconsidered synonymous, unless the context clearly requires otherwise.Additionally, computer 800 may include mass storage devices 806 (such asdiskette, hard drive, compact disc read only memory (CD-ROM) and soforth), input/output devices 808 (such as display, keyboard, cursorcontrol, remote control, gaming controller, image capture device, and soforth) and communication interfaces 810 (such as network interfacecards, modems, infrared receivers, radio receivers (e.g., Bluetooth,Wi-Fi, Near Field Communications, Radio-frequency identification, and soforth). The elements may be coupled to each other via system bus 812,which may represent one or more buses. In the case of multiple buses,they may be bridged by one or more bus bridges (not shown).

Each of these elements may perform its conventional functions known inthe art. In particular, system memory 804 and mass storage devices 806may be employed to store a working copy and a permanent copy of theprogramming instructions implementing one or more of the operationsassociated with techniques shown in FIGS. 4-7, collectively referred toas computing logic 822. The various elements may be implemented byassembler instructions supported by processor(s) 802 or high-levellanguages, such as, for example, C, that can be compiled into suchinstructions. In various embodiments, the system memory 804 or massstorage 806 may include various memory implementations, includingintegrated flash memory, such as in a System on a Chip, a USB flashdrive, SD Card, on SATA SSD, etc.

The permanent copy of the programming instructions may be placed intopermanent storage devices 806 in the factory, or in the field, through,for example, a distribution medium (not shown), such as a compact disc(CD), or through communication interface 810 (from a distribution server(not shown)). In embodiments, the programming instructions may be storedin one or more computer readable non-transitory storage media. In otherembodiments, the programming instructions may be encoded in transitorystorage media, such as signals.

The number, capability and/or capacity of these elements 810-812 mayvary. Their constitutions are otherwise known, and accordingly will notbe further described.

FIG. 9 illustrates an example least one computer-readable storage medium902 having instructions configured to practice all or selected ones ofthe operations associated with the techniques earlier described, inaccordance with various embodiments. As illustrated, least onecomputer-readable storage medium 902 may include a number of programminginstructions 904. Programming instructions 904 may be configured toenable a device, e.g., computer 800, in response to execution of theprogramming instructions, to perform, e.g., various operations ofprocesses of the figures described above, e.g., but not limited to, tothe various operations performed to perform IoT device hierarchytechniques described herein In alternate embodiments, programminginstructions 904 may be disposed on multiple least one computer-readablestorage media 902 instead.

Referring back to FIG. 8, for one embodiment, at least one of processors802 may be packaged together with a memory having computational logic822 configured to practice aspects of processes of FIGS. 4-7. For oneembodiment, at least one of processors 802 may be packaged together witha memory having computational logic 822 configured to practice aspectsof processes of FIGS. 4-7 to form a System in Package (SiP). For oneembodiment, at least one of processors 802 may be integrated on the samedie with a memory having computational logic 822 configured to practiceaspects of processes of FIGS. 4-7. For one embodiment, at least one ofprocessors 802 may be packaged together with a memory havingcomputational logic 822 configured to practice aspects of processes ofFIGS. 4-7 to form a System on Chip (SoC). For at least one embodiment,the SoC may be utilized in, e.g., but not limited to, a computingtablet. (e.g., Wi-Fi, Blue Tooth, Blue Tooth Low Energy, Near FieldCommunications, Radio-frequency identification (RFID), etc.) and othercomponents as necessary to meet functional and non-functionalrequirements of the system.

Computer-readable media (including at least one computer-readablemedia), methods, apparatuses, systems and devices for performing theabove-described techniques are illustrative examples of embodimentsdisclosed herein. Additionally, other devices in the above-describedinteractions may be configured to perform various disclosed techniques.Particular examples of embodiments, described herein include, but arenot limited to, the following:

Example 1 may include an Internet of Things (IoT) device, including aresource and an actuator coupled with the resource to set one or moreattributes of the resource. The resource may be associated with a uniqueresource identifier (URI) and a plurality of properties. The URI mayuniquely identify the resource among a plurality of resources disposedamong IoT devices of an IoT device hierarchy. The plurality ofproperties may include a hierarchical interface property that indicatesthe resource may be accessible in a hierarchical manner, wherein thehierarchical interface property may be at least one of a parent URIproperty or a child URI property. The parent URI property, whenincluded, may have a property value that identifies a parent URI of aparent resource of the plurality of resources which has a parentresource relationship to the resource in the IoT device hierarchy. Thechild URI property, when included, may have a property value thatidentifies a child URI of a child resource of the plurality of resourceswhich has a child resource relationship to the resource.

Example 2 may include the IoT device of example 2, wherein the pluralityof properties further may include an interface type property whichindicates that the IoT device may be associated with a hierarchicalaccess interface to provide access to one or more descendant resourceswhich are subordinate to the resource in the IoT device hierarchy.

Example 3 may include the IoT device of example 2, wherein thehierarchical access interface may be further to, in response to receiptof a property, provide access to resources which are descendants of theresource in the IoT device hierarchy and which match the receivedproperty.

Example 4 may include the IoT device of example 3, wherein thehierarchical access interface may be to facilitate retrieval ofinformation about the one or more resources which are descendants of theresource.

Example 5 may include the IoT device of example 3, wherein thehierarchical access interface may be to facilitate setting of attributesto the one or more resources which are descendants of the resource.

Example 6 may include the IoT device of any of examples 1-5, and mayfurther include a resource access module to respond to a request forproperties of the resource with the hierarchical interface property.

Example 7 may include the IoT device of any of examples 1-6, wherein theplurality of properties may include a plurality of parent URIproperties.

Example 8 may include the IoT device of any of examples 1-7, wherein theplurality of properties may include a plurality of child URI properties.

Example 9, may include the IoT device of any of examples 1-8, whereinthe IoT device hierarchy may include parent/child relationships betweenone or more of: a pair of device resources, a device resource and aresource representing a grouping of devices, and a pair of resourcesrepresenting groupings of devices.

Example 10 may include one or more computer-readable media containinginstructions written thereon that, in response to execution by aInternet of Things (IoT) device, cause the device to facilitate accessto a resource associated with the IoT device. The instructions may causethe IoT device to respond to requests sent to a unique resourceidentifier (URI) associated with the device to set attributes of theresource, wherein the URI uniquely identifies the resource among aplurality of resources disposed among IoT devices of an IoT devicehierarchy and respond to requests for properties of the IoT device witha plurality of properties. The plurality of properties may include ahierarchical interface property that indicates the resource may beaccessible in a hierarchical manner, wherein the hierarchical interfaceproperty may be at least one of a parent URI property or a child URIproperty. The parent URI property, when included, may have a propertyvalue that identifies a parent URI of a parent resource of the pluralityof resources which has a parent resource relationship to the resource inthe IoT device hierarchy The child URI property, when included, may havea property value that identifies a child URI of a child resource of theplurality of resources which has a child resource relationship to theresource.

Example 11 may include the computer-readable media of example 10,wherein respond to requests for properties may include respond with aninterface type property that indicates that the IoT device may beassociated with a hierarchical access interface to provide access to oneor more descendant resources which are subordinate to the resource inthe IoT device hierarchy.

Example 12 may include the computer-readable media of example 11,wherein the instructions may be further to cause the IoT device toprovide the hierarchical access interface.

Example 13 may include the computer-readable media of example 12,wherein provide the hierarchical access interface may include, inresponse to receipt of a property, provide access to resources which aredescendants of the resource in the IoT device hierarchy and which matchthe received property.

Example 14 may include the computer-readable media of example 12,wherein provide the hierarchical access interface may include facilitateretrieval of information about the one or more resources which aredescendants of the resource.

Example 15 may include the computer-readable media of example 13,wherein provide the hierarchical access interface may include facilitatesetting of attributes to the one or more resources which are descendantsof the resource.

Example 16 may include the computer-readable media of any of examples10-15, wherein respond to requests for properties may include respondwith a plurality of parent URI properties.

Example 17 may include the computer-readable media of any of examples10-16, wherein respond to requests for properties may include respondwith a plurality of child URI properties.

Example 18 may the computer-readable media of any of examples 10-17,wherein the IoT device hierarchy may include parent/child relationshipsbetween one or more of: a pair of device resources, a device resourceand a resource representing a grouping of devices, and a pair ofresources representing groupings of devices.

Example 19 may include a computer-implemented method for an Internet ofThings (IoT) device to facilitate access to a resource associated withthe IoT device. The method may include responding, by the IoT device, torequests sent to a unique resource identifier (URI) associated with thedevice to set attributes of the resource, wherein the URI uniquelyidentifies the resource among a plurality of resources disposed amongIoT devices of an IoT device hierarchy. The method may also includeresponding, by the IoT device, to requests for properties of the IoTdevice with a plurality of properties. The plurality of properties mayinclude a hierarchical interface property that indicates the resourcemay be accessible in a hierarchical manner, wherein the hierarchicalinterface property may be at least one of a parent URI property or achild URI property. The parent URI property, when included, may have aproperty value that identifies a parent URI of a parent resource of theplurality of resources which has a parent resource relationship to theresource in the IoT device hierarchy. The child URI property, whenincluded, may have a property value that identifies a child URI of achild resource of the plurality of resources which has a child resourcerelationship to the resource.

Example 20 may include the computer-implemented method of example 19,wherein responding to requests for properties may include respondingwith an interface type property that indicates that the IoT device maybe associated with a hierarchical access interface to provide access toone or more descendant resources which are subordinate to the resourcein the IoT device hierarchy.

Example 21 may include the computer-implemented method of example 20,and may further include providing, by the IoT device, the hierarchicalaccess interface.

Example 22 may include the computer-implemented method of example 21,wherein providing the hierarchical access interface may include, inresponse to receipt of a property, providing access to resources whichare descendants of the resource in the IoT device hierarchy and whichmatch the received property.

Example 23 may include the computer-implemented method of example 21,wherein providing the hierarchical access interface may includefacilitating retrieval of information about the one or more resourceswhich are descendants of the resource.

Example 24 may include the computer-implemented method of example 21,wherein providing the hierarchical access interface may includefacilitating setting of attributes to the one or more resources whichare descendants of the resource.

Example 25 may include the computer-implemented method of any ofexamples 19-24, wherein responding to requests for properties mayinclude responding with a plurality of parent URI properties.

Example 26 may include the computer-implemented method of any ofexamples 19-25, wherein responding to requests for properties mayinclude responding with a plurality of child URI properties.

Example 27 may include the computer-implemented method of any ofexamples 19-26, wherein the IoT device hierarchy may includeparent/child relationships between one or more of: a pair of deviceresources, a device resource and a resource representing a grouping ofdevices, and a pair of resources representing groupings of devices.

Example 28 may include an Internet of Things (IoT) device to facilitateaccess to a resource associated with the IoT device. The IoT device mayinclude means for responding to requests sent to a unique resourceidentifier (URI) associated with the device to set attributes of theresource, wherein the URI uniquely identifies the resource among aplurality of resources disposed among IoT devices of an IoT devicehierarchy and means for responding to requests for properties of the IoTdevice with a plurality of properties. The plurality of properties mayinclude a hierarchical interface property that indicates the resourcemay be accessible in a hierarchical manner, wherein the hierarchicalinterface property may be at least one of a parent URI property or achild URI property. The parent URI property, when included, may have aproperty value that identifies a parent URI of a parent resource of theplurality of resources which has a parent resource relationship to theresource in the IoT device hierarchy. The child URI property, whenincluded, may have a property value that identifies a child URI of achild resource of the plurality of resources which has a child resourcerelationship to the resource.

Example 29 may include the IoT device of example 28, wherein means forresponding to requests for properties may include means for respondingwith an interface type property that indicates that the IoT device maybe associated with a hierarchical access interface to provide access toone or more descendant resources which are subordinate to the resourcein the IoT device hierarchy.

Example 30 may include the IoT device of example 29, and may furtherinclude means for providing the hierarchical access interface.

Example 31 may include the IoT device of example 30, wherein means forproviding the hierarchical access interface may include means for, inresponse to receipt of a property, providing access to resources whichare descendants of the resource in the IoT device hierarchy and whichmatch the received property.

Example 32 may include the IoT device of example 30, wherein means forproviding the hierarchical access interface may include means forfacilitating retrieval of information about the one or more resourceswhich are descendants of the resource.

Example 33 may include the IoT device of example 30, wherein means forproviding the hierarchical access interface may include means forfacilitating setting of attributes to the one or more resources whichare descendants of the resource.

Example 34 may include the IoT device of any of examples 28-33, whereinmeans for responding to requests for properties may include means forresponding with a plurality of parent URI properties.

Example 35 may include the IoT device of any of examples 28-34, whereinmeans for responding to requests for properties may include means forresponding with a plurality of child URI properties.

Example 36 may include the IoT device of any of examples 28-35, whereinthe IoT device hierarchy may include parent/child relationships betweenone or more of: a pair of device resources, a device resource and aresource representing a grouping of devices, and a pair of resourcesrepresenting groupings of devices.

Example 37 may include one or more computer-readable media containinginstructions written thereon that, in response to execution by acomputing system, cause the computing system to access a resource. Theinstructions may cause the computing system to identify a first resourceof an Internet of Things (IoT) device, wherein the first resource may beamong a plurality of resources disposed among IoT devices of an IoTdevice hierarchy. The instructions may also cause the computing systemto receive a hierarchical interface property associated with the firstresource that indicates the resource may be accessible in a hierarchicalmanner, the hierarchical interface property including at least one of aparent URI property or a child URI property. The instructions may alsocause the computing system to, based on the at least one of the parentURI property or the child URI property, determine a hierarchicalrelationship between the first resource and a second resource, whereinthe second resource may be a parent or child of the first resource inthe IoT device hierarchy.

Example 38 may include the apparatus of example 37, wherein theinstructions may further cause the computing system to: receive anindication that the first resource may be no longer accessible or willno longer be accessible; request at least one of a parent URI propertyor a child URI property may include request the parent URI property;and, based at least in part on the received parent URI property, accessat least one of a parent resource or a child resource for the firstresource.

Example 39 may include the apparatus of any of examples 37 or 38,wherein the instructions may be further to cause the computing systemto: receive an interface type property that indicates that the IoTdevice may be associated with a hierarchical access interface; andaccess, using a hierarchical access interface associated with the firstresource, one or more resources which are descendants of the firstresource in the IoT device hierarchy.

Example 40 may include the apparatus of any of examples 37-39, whereinthe IoT device hierarchy may include parent/child relationships betweenone or more of: a pair of device resources, a device resource and aresource representing a grouping of devices, and a pair of resourcesrepresenting groupings of devices.

Example 41 may include a computer-implemented method for accessing aresource, including: identifying, by a computing system, a firstresource of an Internet of Things (IoT) device, the first resource maybe among a plurality of resources disposed among IoT devices of an IoTdevice hierarchy; receiving, by the computing system, a hierarchicalinterface property associated with the first resource that indicates theresource may be accessible in a hierarchical manner, the hierarchicalinterface property including at least one of a parent URI property or achild URI property; and based on the at least one of the parent URIproperty or the child URI property determining, by the computing system,a hierarchical relationship between the first resource and a secondresource, wherein the second resource may be a parent or child of thefirst resource in the IoT device hierarchy.

Example 42 may include the computer-implemented method of example 41,and may further include: receiving, by the computing system, anindication that the first resource may be no longer accessible or willno longer be accessible; requesting, by the computing system, at leastone of a parent URI property or a child URI property may include requestthe parent URI property; and, based at least in part on the receivedparent URI property, accessing, by the computing system, at least one ofa parent resource or a child resource for the first resource.

Example 43 may include the computer-implemented method of any ofexamples 41 or 42, and may further include: receiving, by the computingsystem, an interface type property that indicates that the IoT devicemay be associated with a hierarchical access interface; and accessing,by the computing system, using a hierarchical access interfaceassociated with the first resource, one or more resources which aredescendants of the first resource in the IoT device hierarchy.

Example 44 may include the computer-implemented method of any ofexamples 41-43, wherein the IoT device hierarchy may includeparent/child relationships between one or more of: a pair of deviceresources, a device resource and a resource representing a grouping ofdevices, and a pair of resources representing groupings of devices.

Example 45 may include an apparatus for accessing a resource, including:means for identifying a first resource of an Internet of Things (IoT)device, the first resource may be among a plurality of resourcesdisposed among IoT devices of an IoT device hierarchy; means forreceiving a hierarchical interface property associated with the firstresource that indicates the resource may be accessible in a hierarchicalmanner, the hierarchical interface property including at least one of aparent URI property or a child URI property; and means for determining,based on the at least one of the parent URI property or the child URIproperty, a hierarchical relationship between the first resource and asecond resource, wherein the second resource may be a parent or child ofthe first resource in the IoT device hierarchy.

Example 46 may include the apparatus of example 45, and may furtherinclude: means for receiving an indication that the first resource maybe no longer accessible or will no longer be accessible; means forrequesting at least one of a parent URI property or a child URI propertymay include request the parent URI property; and means for accessing,based at least in part on the received parent URI property, at least oneof a parent resource or a child resource for the first resource.

Example 47 may include the apparatus of any of examples 45 or 46, andmay further include: means for receiving an interface type property thatindicates that the IoT device may be associated with a hierarchicalaccess interface; and means for accessing, using a hierarchical accessinterface associated with the first resource, one or more resourceswhich are descendants of the first resource in the IoT device hierarchy.

Example 48 may include the apparatus of any of examples 45-47, whereinthe IoT device hierarchy may include parent/child relationships betweenone or more of: a pair of device resources, a device resource and aresource representing a grouping of devices, and a pair of resourcesrepresenting groupings of devices.

Although certain embodiments have been illustrated and described hereinfor purposes of description, a wide variety of alternate and/orequivalent embodiments or implementations calculated to achieve the samepurposes may be substituted for the embodiments shown and describedwithout departing from the scope of the present disclosure. Thisapplication is intended to cover any adaptations or variations of theembodiments discussed herein. Therefore, it is manifestly intended thatembodiments described herein be limited only by the claims.

Where the disclosure recites “a” or “a first” element or the equivalentthereof, such disclosure includes one or more such elements, neitherrequiring nor excluding two or more such elements. Further, ordinalindicators (e.g., first, second or third) for identified elements areused to distinguish between the elements, and do not indicate or imply arequired or limited number of such elements, nor do they indicate aparticular position or order of such elements unless otherwisespecifically stated.

What is claimed is:
 1. An Internet of Things (IoT) device, comprising: afirst resource; and an actuator coupled with the first resource to setone or more attributes of the first resource; wherein: the firstresource is associated with a first unique resource identifier (URI) anda plurality of properties; the URI uniquely identifies the firstresource among a plurality of resources of an IoT device hierarchy,having at least three hierarchical levels, the first resource beingdisposed at a first of the at least three hierarchical levels; and theplurality of properties includes a hierarchical interface property thatindicates support for accessing related ones of the plurality ofresources in a hierarchical manner, and at least one of a parent URIproperty or a child URI property; the parent URI property, whenincluded, has a property value that identifies a second URI of a secondresource of the plurality of resources disposed at a second of the atleast three hierarchical levels, the second resource having a parentresource relationship to the first resource in the IoT device hierarchy;and the child URI property, when included, has a property value thatidentifies a third URI of a third resource of the plurality of resourcesis posed at a third of the at least three hierarchical levels, the thirdresource having a child resource relationship to the first resource; andwherein: support for accessing related ones of the plurality ofresources in a hierarchical manner includes support for accessing fourthone or more of the plurality of resources disposed at a fourth level ofthe IoT device hierarchy, the fourth one or more resources being childor children resources of fifth one or more of the plurality of resourcesdisposed at a fifth level of the IoT device hierarchy higher than thefourth level, via a single request to a sixth of the plurality ofresource disposed at a sixth level of the IoT device hierarchy higherthan the fifth level, the fifth one or more resources being child orchildren resources of the sixth resource.
 2. The IoT device of claim 1,wherein the single request includes a property, and the fourth one ormore resources at the fourth level of the IoT device hierarchy match thereceived property.
 3. The IoT device of claim 1, wherein accessing thefourth one or more resources at the fourth level of the IoT devicehierarchy comprises retrieving information about the fourth one or moreresources.
 4. The IoT device of claim 1, wherein accessing the fourthone or more resources at the fourth level of the IoT device hierarchycomprises setting attributes of the fourth one or more resources.
 5. TheIoT device of claim 1, wherein the IoT device hierarchy includesparent/child relationships between one or more of: a pair of deviceresources, a device resource and a resource representing a grouping ofdevices, and a pair of resources representing groupings of devices. 6.The IoT device of claim 1, wherein the first resource is one of thefourth one or more resources, and the second resource is one of thefifth one or more resources.
 7. The IoT device of claim 1, wherein thefirst resource is one of the fifth one or more resources, and the secondresource is one of the sixth resource.
 8. The IoT device of claim 1,wherein the first resource the sixth resource, and the third resourceare one of the fifth one or more resources.
 9. The IoT device of claim1, wherein the first resource is one of the fifth one or more resources,and the third resource is one of the fourth one or more resources. 10.One or more non-transitory computer-readable media (CRM) containinginstructions written thereon that, in response to execution by anInternet of Things (IoT) device, cause the IoT device to: respond to setrequests to set attributes of a first resource of the device, uniquelyidentified by a first unique resource identifier (URI), from a pluralityof other resources disposed among other IoT devices that in conjunctionwith the IoT device form an IoT device hierarchy with at least threehierarchical levels; respond to get requests with a plurality ofproperties of the first resource, wherein: the plurality of propertiesincludes a hierarchical interface property that indicates support foraccessing related ones of the plurality of resources in a hierarchicalmanner, and at least one of a parent URI property or a child URIproperty; wherein: the parent URI property, when included, has aproperty value that identifies a second URI of a second resource of theplurality of resources disposed at a second of the at least threehierarchical levels, the second resource having a parent resourcerelationship to the first resource in the IoT device hierarchy; and thechild URI property, when included, has a property value that identifiesa third URI of a third resource of the plurality of resources disposedat a third of the at least three hierarchical levels, the third resourcehaving a child resource relationship to the first resource; and wherein:support for accessing related ones of the plurality of resources in ahierarchical manner includes support for accessing fourth one or more ofthe plurality of resources disposed at a fourth level of the IoT devicehierarchy, the fourth one or more resources being child or childrenresources of fifth one or more of the plurality of resources disposed ata fifth level of the IoT device hierarchy higher than the fourth level,via a single request to a sixth of the plurality of resource disposed ata sixth level of the IoT device hierarchy higher than the fifth level,the fifth one or more resources being child or children resource of thesixth resource.
 11. The non-transitory computer-readable media of claim10, wherein the single request includes a property, and the fourth oneor more resources at the fourth level of the IoT device hierarchy matchthe received property.
 12. The non-transitory computer-readable media ofclaim 10, wherein accessing the fourth one or more resources at thefourth level of the IoT device hierarchy comprises retrievinginformation about the fourth one or more resources.
 13. Thenon-transitory computer-readable media of claim 10, wherein accessingthe fourth one or more resources at the fourth level of the IoT devicehierarchy comprises setting attributes of the fourth one or moreresources.
 14. The non-transitory computer-readable media of claim 10,wherein respond to requests for properties comprises respond with aplurality of parent URI properties.
 15. The non-transitorycomputer-readable media of claim 10, wherein respond to requests forproperties comprises respond with a plurality of child URI properties.16. A computer-implemented method comprising: responding, by anInternet-of-Things (IoT) device, to requests to set attributes of afirst resource, wherein the first resource is identified by a uniqueresource identifier (URI), among a plurality of resources disposed amongIoT devices of an IoT device hierarchy having at least threehierarchical levels; responding, by the IoT device, to requests forproperties of the first resource, wherein: the plurality of propertiesincludes a hierarchical interface property that indicates support foraccessing related ones of the resources in a hierarchical manner, and atleast one of a parent URI property or a child URI property; the parentURI property, when included, has a property value that identifies asecond URI of a second resource of the plurality of resources disposedat a second of the at least three hierarchical levels, the secondresource having a parent resource relationship to the first resource inthe IoT device hierarchy; and the child URI property, when included, hasa property value that identifies a third URI of a third resource of theplurality of resources disposed at a third of the at least threehierarchical levels, the third resource having a child resourcerelationship to the first resource; and wherein support for accessingrelated ones of the plurality of resources in a hierarchical mannerincludes support for accessing fourth one or more of the plurality ofresources disposed at a fourth level of the IoT device hierarchy, thefourth one or more resources being child or children resources of fifthone or more of the plurality of resources disposed at a fifth level ofthe IoT device hierarchy higher than the fourth level, via a singlerequest to a sixth of the plurality of resource disposed at a sixthlevel of the IoT device hierarchy higher than the fifth level, the fifthone or more resources being child or children resources of the sixthresource.
 17. The computer-implemented method of claim 16, wherein thesingle request includes a property, and the fourth one or more resourcesat the fourth level of the IoT device hierarchy match the receivedproperty.
 18. The computer-implemented method of claim 16, whereinaccessing the fourth one or more resources at the fourth level of theIoT device hierarchy comprises retrieving information about the fourthone or more resources or setting attributes of the fourth one or moreresources.